Heat-exchange piping.



G. HILDEBRANDT.. HEAT EXCHANGE-PIPING.

APPLICATION FILED IAN. 3, 1910. v

979,762; A L Patentedneaz?, 1910.

r r11/l GOTTHOHLD HLDEBRANDT, OF SPANDAU-TIEFWEBDEB 29B, `NIEAR. BERLIN, GER'IMANY.

HEAT-EXCHANGE PIPING.

Specification of Letters Patent.

Application led January 3, 1910. Serial No. 536,098.

Patented Dec. 27, 1910.

' To all 'whom it may concern:

Be it known that I, Go'rrnonn Himn- BRANDT, engineer, citizen of Germany, subject of the Kin `of Prussia and Emperor of Germany, resi ing at Spandau-Tiefwerder, 29h near Berlin, in the Kingdom of Prussia and Empire of Germany, have invented new and useful Improvements in a Heat-Exchange Piping, of which -the following is a specification. j

' My invention relates to tubular conduits for devices in which exchange of heat takes placel` particularly for apparatus for producing cold` as in machines for liquefying air and the like.

A primary object of my invention is to provide an improved conduit or piping comprising a bundle or nest of tubes contacting one with another and withan outer inclosingtube or pipe. In this manner I obtain the advantage that the piping forms an ventirety firmly joined together, which vcan be bent and deformed in any optional manner without the internal special conditions materially changing. Another advantage, particularly when my piping is employed in apparatus for producing cold, consists in the contacting or cooling surfaces ofthe 'materials the heat ofV which is to be exchanged, being considerably increased. This is important particularly when the piping is used as a counter-current conduit. Lastly, in thecase of the subject-matter of my invention the process of manufacture is very much simpliied, `as no kind of solderedv joints or other attachment and stiifening means are requisite for connecting the internal and external tubes, but, on the contrary, by simply drawing in the vtubes they are fixed immovably in the inclosing tube or pipe.

For the external tube vor: pipe I preferably employ a soft, compressible metal, e. g.

lead, which snugs closely around the inner tubes and becomes connected irmly'with them. For increasing the resistance to pres-- sure and simultaneously improving `the in;

sulation towardA 'the outside I coat the leady pipe with an insulating material which possesses simultaneously considerablestrength and slight extensibility; for this, strips of l `firm, stiff. textile material,-such as e. g. tape,

` canvas and the like, wound or plaited around the pipe are particularly suitable. Owing to this covering the lead pipe is able to resist internal pressure land mechanical injury from Without.

When employed as counter-current conduits in apparatus for producing cold the internal tubes of my improved piping are preferably used as high pressure conduit and the spaces between them or between their Walls and the wall of the inclosing pipe as cooling conduit. To this end, I preferably make the internal tubes of a pressure-resisting material, e. g. fiexible copper. When using the piping in this manner I obtain the advantage that the tubes forming the nest more than two different liquids or gasesfor exchange of heat.

One illustrative embodiment `of my inven- I tion is represented by way of example in the accompanying drawlng wherein Figure 1 is' across-section, Fig. 2 a side elevation, partly in longitudinal section and partly broken away, and Fig. 3 a side elevation showing a portion of a half finished conduit according to my invention.

Referring to the drawing, the tubes ca contact closely and tightly one with another' and with the external tube or pipe V 'A 90 internal l. As'seen in Fig. 3, the outside pipe b has i wound around ita-strip of textile materiall or a band e. Then the internal tubes a and vthe externalvpipe b consist of iexible Amaterial the piping can be bent optionally when being iittedup and laid without the position of the internal tubes a relatively to one another and to the inclosing pipe b being changed, Vas ,vvill be understood from the drawing" f Having now described myl invention what I claim and desire to secure by Letters'Patent of the United States is:

1. A heat exchange pipe comprising an flexible inner-tubes inclosed by said outer tube and arranged closely together therein `outer tube of pliable metal and a plurality of to snugly contact with each other and with v the inner wall of t-he outer tube.

2. Heat-exchange piping comprising a bundle of flexible tubes .mclosed by an outer 3. A heat exchange piping comprising a bundle of flexible tubes inclosed by an outer pipe of pliable metal, the inner tubes contacting one with another and with the inner Wall of said pipe, said pipe being surrounded with an insulated material.

In testimony whereof I have hereunto set 15 my hand in presence of two `subscribing.; witnesses.

GOTTHOIJD HILDEBRANDT.

Witnesses WOLDEMAR HAUPT, HEN RY HASPER. 

